William e



(No Model.)

w. E. 0-001) 860. 0. LINDROTH. PISTON.

No. 451,478. Patented May 5,1891.

Wifnesses: 6 inveni'o"s s UNTTED STATES XVILLIAM E. GOOD AND OARL-OSKARLINDROTH, OF PHILADELPHIA, PENN- .SYLVANIA, ASSIGNORS TO THE SOUTIDVARKFO COMPANY, OF SAME PLACE.

PATENT EEicE.

PISTON.

SPECIFICATION forming part of Letters Patent No. 451,478, dated May 5,1891.

Application filed November 20, 1890. $erial No. 371,988. [No model.)

- T at whom it may concern:

Beit known that we, WILLIAM E. G001) and CARL OSKAR LINDROTH, both ofthe city and county of Philadelphia, State of Pennsyl- Vania, haveinvented a certain new and useful Improved Piston, of which thefollowing is a true and exact description, reference being had to theaccompanying drawings, which form a part of this specification.

Our invention relates to the construction of pistons and has for itsobject to provide a piston of improved construction and of which theouter ring, called the bull-ring,

can be readily removed and adjusted without I5 separating the pistonproper from the rod to which it is attached. This is especiallyimportant in compound engines in which the high and low pressurecylinders are arranged in line with each other and with their pistonssecured to the same rod.

The novel features of our invention will be best understood as describedin connection with the drawings in which they are illustrated, and inwhich- 2 5' Figure 1 is a side elevation showing ahigh and low pressurecylinder arranged in line with each other and with their pistons securedto the same piston-rod. Fig. 2 is a face view of the piston with thefollower-plate re- 0 moved. Fig. 3 is a cross-section taken on the line1 2 of Fig. 2, and showing the followerplate in place. Fig. lis asectional view taken 011 the line'3 4 of Fig. 3; Fig. 5, a sectionalView taken on the line 5 6 of Fig. 4?, and Fig.

3 5 6 a side view showing hoW the parts ofthe bull-ring are fastenedtogether.

A and B are respectively the low and high pressure cylinders of theengine; 0, the space between the two cyinders; D, the piston-rod;

E and E, pistons situated, respectively,in the high and low pressurecylinders.

The piston is made up of the piston proper or piston center, which issecured to the piston-rod, an outer ring, called the bull-ring,

which is secured around the periphery of the piston center, and which wepreferably form in sections, so that it can be removed readily from thecenter, and finally the packingrings, which are secured in grooves inthe bull-ring.

In the drawings we have indicated the piston center by the letter F, fbeing the central hole in which the piston-rod is secured, f a flangeprojecting beyond the face of the piston center on one edge, f a recessformed in the opposite edge to receive a follower-plate, f a threadedscrew-hole, and f f &c., transverse grooves formed across the face ofthe piston center to receive keys or wedges.

G is the outer or bull ring of the piston, which is secured to the faceof the piston center and should have aface of the same breadth as thepiston center. In the outer face of the bull-ring grooves g g are formedto receive packing-rings, and the inner face of the bullriug is providedfor inwardly-projectinglugs or flanges g g, &c., which fit between theflange f on one side and the follower-plate on the other. In theseinwardly-projecting lugs key-grooves g are formed, so that they willregister with keygrooves f in the piston center.

An important feature of the construction of the bull-ring is that itshould be made in sections, as shown, lugs g g being provided at theedge of each section, so that abutting sections can be bolted together,as shown. It is sufficient that theb ull-rin g should be formed in twosections, and this plan is illustrated in the drawings.

H is the follower-plate which fits into the recess f and has aprojecting flange h, which extends above the face of the piston-centersurface, together with the flange f, to hold the bull-ring in place uponthe center. The follower-plate is held in position by means of screws 1,which pass through it and enter the threaded perforations f 3 in thepiston center.

In order to prevent the bull-ring from turning on the center and also toprovide means for adjusting it from time to time, so as to keep thepiston-rod in the cent-er of the cylinder, we provide keys or wedges J,adapted to enter the registering grooves f 9 the adjustment preferablybeing effected by means of the insertion or removal of thin plates orUNDRY AND MAOHINE shims, indicated at K. These shims and keys areinserted before the follower is secured to the piston-center and areheld in place by the said follower.

IOO

13y carrying the face of the bull-ring over and key-grooves f formedalong; its face, of

the followerand the flange f we are enabled to a follower II, having aflange 71 a divided secure the packing-rings (indicated by theletbull-ring G, adapted to fit between and over I 5 ter L) close to theouter edge of the piston, flanges f and 7L, grooved to receive packing-5 thus securing abroad bearing-surface and in- I rings, and having alsotransverse grooves 9,

swing that the said surface shall not diminregisteringwith groovesffiand adjusting-keys ish with the adjustment of the Wedges. J, adaptedto fit in grooves g g.

Having now described our invention, what WILLIAM E. GOOD. we claim asnew, and desire to secure by Let G. O. LINDRO'III. 1o ters Patent, isWitnesses:

I11 a piston, the combination, with a piston LEWIS R. DICK,

center, as F, having a flange f on one edge FRANCI." 'l. CHAMBERS.

